It's like just because someone slapped a label on a thing we're not allowed to do the thing anymore. We need an "Anti-Godwin's Law" that states no mention of Nazis or Hitler can be made on the internet without someone inevitably invoking Godwin's Law.
It just seems nonsensically reductive to go 'the nazis did it! therefore its bad!'
The first poster essentially said "this is so normal, even Nazis do it".
We consider Nazis to be abnormal, so if a behavior is common many groups inclusive of Nazis it can be used to imply that the behavior is something inherent to human beings or human governments or human societies.
"As an online discussion grows longer, the probability of a comparison involving Corvairs approaches 1"
This law, as best as I can determine, is rubbish.